How many seats the GOP needs to lose for a "blue wave"

Paul Ryan looking up
Paul Ryan is leaving Congress, but his party could lose seats in this election. Photo: Alex Wong/Getty Images

Republicans would need to lose 48 U.S. House seats and seven U.S. Senate seats to technically qualify as a "wave" election against the president's party, according to a new report from Ballotpedia.

Why it matters: The report is really about semantics and establishing an objective definition of a "wave election," but it gives important historical context for the 2018 election and helps better understand each party's chances in November.